Investigation of the Cohesive Sediments Influence on the Meandering Channel Development

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

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Direct percutaneous access to a mesenteric vein for antegrade embolization of esophageal varices: A case report

A 79-year-old woman with a history of advanced gastric cancer and portal vein tumor thrombus, treated with surgery and chemoradiotherapy, presented with hematemesis due to esophageal variceal bleeding around the esophagojejunal anastomosis. Endoscopic treatment was unsuccessful. Due to portal vein occlusion, percutaneous transhepatic access was difficult. Thus, the middle colic vein, which was dilated due to portal vein occlusion, was percutaneously punctured, and antegrade embolization of a jejunal vein feeding the varices was performed using a microcatheter through a 4-F dilator placed as a sheath. After embolization, the sheath was removed, and ultrasound-guided compression of the puncture site was performed. No bleeding complication occurred. Therefore, direct percutaneous access to a mesenteric vein is a viable alternative to transhepatic access

CO2 Looping Cycle for CO2 Separation

A dual fluidized bed process using CaO-based solid sorbent is considered to be a promising technology to separate CO2 from flue gas with low energy penalty. As reactor for CaO-looping cycle, both bubbling fluidized bed and “fast” fluidized bed are available, thus four possible combinations, (bubbling or fast absorber)x(bubbling or fast regenerator), are conceivable for this process. In this work, the authors discuss favorable combination of reactor type from viewpoints of heat removal from carbonation reactor and on energy penalty associated with dilution of pure oxygen by CO2 in the regenerator. As conclusion, suitable combination was found to be bubbling bed absorber and fast regenerator. Design of bench-scale experimental apparatus of the present system was also carried out. Bubbling bed absorber was designed to achieve 86 % CO2 removal efficiency from flue gas. Preliminary operating results of solid circulation at room temperature are also presented

EFFECTS OF NON-UNIFORM SEDIMENT ON DUNE FORMATION

The numerical model for non-uniform sediment is performed to simulate the characteristics of sand dunes. With the use of the concepts of bed layer model and size fractional transport, the mechanism of grain sorting at various locations of sand dunes can be investigated. It is found that the sand wave formation and its migration process can be reproduced. Using the experimental results, the model provides the satisfactory agreement in grain sorting and wave height. In addition, the effect of non-uniform sediment is studied. Under the same hydraulic conditions and mean grain size, the numerical simulations of the non-uniform sediment case are compared with that of the uniform sediment case. Again, the simulated results are consistent with the experimental results that the migration velocities of sand dunes in the non-uniform sediment case are faster than those of the uniform sediment case, and the wave heights of sand dunes of the non-uniform sediment case are smaller than those of the uniform sediment case